I'm going to have to choose two. If I could I would choose one hundred, I'm sure. I've been listening to these a lot lately, so they get to be my favorites today. 
http://www.youtube.com/watch?v=w5zUVkywhfo
http://www.youtube.com/watch?v=vQVeaIHWWck

http://www.youtube.com/watch?v=w5zUVkywhfo
http://www.youtube.com/watch?v=vQVeaIHWWck